Grain hopper



FIG. 1 is a top perspective view of a grain hopper showing my newdesign;

FIGS. 2 and 6 are side elevation views thereof;

FIGS. 3 and 5 are end elevation views thereof;

FIG. 4 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof.

The ornamental design for a grain hopper, as shown.